WO2019031505A1 - Station de base sans fil et dispositif utilisateur - Google Patents

Station de base sans fil et dispositif utilisateur Download PDF

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Publication number
WO2019031505A1
WO2019031505A1 PCT/JP2018/029615 JP2018029615W WO2019031505A1 WO 2019031505 A1 WO2019031505 A1 WO 2019031505A1 JP 2018029615 W JP2018029615 W JP 2018029615W WO 2019031505 A1 WO2019031505 A1 WO 2019031505A1
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Prior art keywords
secondary cell
random access
cell group
access procedure
base station
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PCT/JP2018/029615
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English (en)
Japanese (ja)
Inventor
高橋　秀明
徹 内野
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株式会社Ｎｔｔドコモ
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Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to US16/637,610 priority Critical patent/US20200260494A1/en
Priority to JP2019535675A priority patent/JPWO2019031505A1/ja
Publication of WO2019031505A1 publication Critical patent/WO2019031505A1/fr
Priority to JP2022119865A priority patent/JP2022141934A/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to a radio base station and a user apparatus that set a split bearer.
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced
  • 5G New Radio (NR) 5G New Radio
  • Non-Patent Document 1 a split via a secondary cell group (SCG) as a type of bearer in dual connectivity (DC) using an LTE wireless base station and an NR wireless base station A bearer (Split bearer via SCG) is defined.
  • SCG secondary cell group
  • DC dual connectivity
  • the core The bearer for the user plane (S1-U) between the network and the radio base station is set only between the core network (EPC (Evolved Packet Core)) and the NR SgNB.
  • EPC Evolved Packet Core
  • the bearer is branched to the LTE MeNB in the PDCP layer of the NR SgNB to configure a split bearer.
  • User data (for example, downlink data) is transmitted from the LTE MeNB and the NR SgNB to the user equipment (UE) via the split bearer.
  • UE user equipment
  • Non-Patent Document 1 a case is defined in which the LTE MeNB forms a macro cell and the NR SgNB forms a small cell. There is.
  • An object of the present invention is to provide a radio base station and a user apparatus that are compatible with the suppression of the increase in the amount and the delay reduction associated with the split bearer reconfiguration.
  • a first bearer (split bearer B SP ) is set that passes from the core network through the secondary cell group and branches from the secondary cell group to the radio base station (eNB 100A) included in the master cell group
  • the radio base station in a radio communication system (radio communication system 10) in which data is transmitted to a user apparatus (UE 200) via the first bearer, wherein radio link failure (S-RLF) in the secondary cell group
  • a fault notification receiving unit (fault notification receiving unit 130) for receiving from the user apparatus a fault notification indicating that a failure has occurred, and the secondary cell of the first bearer when the fault notification receiving unit receives the fault notification While releasing resources only in layers lower than a predetermined layer (RLC layer) in the group
  • a resource control unit (resource control unit 140) that holds upper layer resources (PDCP layer or more) of a layer
  • a random access procedure execution unit (random access procedure execution unit 150) that executes the user device and a random access procedure
  • the resource control unit reconfigures the first
  • a first bearer is set that passes from a core network via a secondary cell group and branches from the secondary cell group to a radio base station included in the master cell group, and a user via the first bearer
  • a failure notification unit that transmits a failure notification indicating that a wireless link failure in the secondary cell group has occurred to the wireless base station (a failure notification unit 230);
  • a random access procedure execution unit for executing a random access procedure, a quality measurement unit (quality measurement unit 250) for executing measurement of cell reception quality in the secondary cell group, and the cell reception quality by the quality measurement unit If the threshold is equal to or greater than a predetermined threshold, the user of the secondary cell group And a connection control unit (connection control unit 220) for reconnection of the device, and in response to the radio link failure, only resources of lower layers than a predetermined layer in the secondary cell group of the first bearer are released.
  • the upper layer resource of the predetermined layer is held, and the connection control unit reconfigures the first bearer when the user apparatus reconnects to the same secondary cell group as before releasing the resource,
  • the random access procedure execution unit performs a random access procedure with another wireless base station included in the secondary cell group to be reconnected.
  • FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10.
  • FIG. 2 is a diagram showing a protocol stack of eNB 100 A (LTE MeNB) and gNB 100 B (NR SgNB).
  • FIG. 3 is a functional block configuration diagram of the eNB 100A and the gNB 100B.
  • FIG. 4 is a functional block configuration diagram of the UE 200.
  • FIG. 5 is a diagram showing a control sequence (operation example 1) of a split bearer including radio link failure (S-RLF) in the secondary cell group.
  • FIG. 6 is a diagram showing a control sequence (operation example 2) of a split bearer including radio link failure (S-RLF) in the secondary cell group.
  • S-RLF radio link failure
  • FIG. 7 is a diagram showing a configuration example of a split bearer B SP (Split bearer via SCG) .
  • FIG. 8 is a diagram showing a configuration example (after partial resource release) of split bearer B SP (Split bearer via SCG).
  • FIG. 9 is a diagram illustrating an example of the hardware configuration of the eNBs 100A and 100B and the UE 200.
  • FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to the present embodiment.
  • the wireless communication system 10 is a wireless communication system according to Long Term Evolution (LTE) and 5G New Radio (NR), and includes a core network 20 and a user apparatus 200 (hereinafter, UE 200).
  • a radio base station 100A (hereinafter, eNB 100A) and a radio base station 100B (hereinafter, gNB 100B) are connected to the core network 20.
  • LTE Long Term Evolution
  • NR 5G New Radio
  • the core network 20 may be an LTE type core network (EPC (Evolved Packet Core)) or an NR type core network (NextGen Core, 5 GC).
  • EPC Evolved Packet Core
  • NextGen Core 5 GC
  • the eNB 100A is a LTE radio base station (eNB), and can configure a master base station.
  • eNB 100A is appropriately described as LTE MeNB (or simply MeNB).
  • the gNB 100B is an NR wireless base station (gNB), and can configure a secondary base station.
  • gNB100B is appropriately described as NR SgNB (or simply SgNB).
  • the eNB 100A forms a cell C1.
  • the gNB 100B forms a cell C2.
  • the cell C1 is a macro cell and the cell C2 is a small cell.
  • a plurality of cells C1 and cells C2 may be formed.
  • a master cell group is configured by the cell C1 formed by the eNB 100A. Further, a cell C2 formed by the gNB 100B constitutes a secondary cell group (SCG).
  • FIG. 2 shows a protocol stack of eNB 100 A (LTE MeNB) and gNB 100 B (NR SgNB).
  • the eNB 100A includes a Medium Access Control (MAC) layer (MAC LTE ), a Radio Link Control (RLC) layer (RLC LTE ), a Packet Data Convergence Protocol (PDCP) layer (PDCP LTE ), and an AS (Access Stratum) sublayer, specifically, Service Data Application Protocol layer (SDAP LTE ).
  • MAC LTE Medium Access Control
  • RLC LTE Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • SDAP LTE Service Data Application Protocol layer
  • the gNB 100B also includes a Medium Access Control (MAC) layer (MAC NR ), a Radio Link Control (RLC) layer (RLC NR ), a Packet Data Convergence Protocol (PDCP) layer (PDCP NR ), and an AS (Access Stratum) sublayer. Specifically, it has a Service Data Application Protocol layer (SDAP NR ). Note that SDAP NR is required when connecting to NextGen Core. When connecting to the EPC, the conventional QoS scheme is followed.
  • MAC Medium Access Control
  • RLC NR Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • AS Access Stratum sublayer
  • SDAP NR Service Data Application Protocol layer
  • a control plane (C plane) and a user plane (U plane) are set between the core network 20 (EPC) and the eNB 100A, but only the U plane is set between the core network 20 (EPC) and the gNB 100B. Is set.
  • the eNB 100A and the gNB 100B have a physical layer below the MAC layer.
  • RRC Radio Resource Control
  • AS sublayer SDAP LTE , SDAP NR .
  • the eNBs 100A and gNB 100B are connected to the core network 20 (EPC) via an S1-U interface. Moreover, eNB100A and gNB100B are connected via X interface (Xx / Xn). As shown in FIG. 2, the eNB 100A has an RLC layer (RLC LTE ) for the X interface, and is connected to the PDCP layer (PDCP NR 2 ) of the gNB 100B via the X interface.
  • RLC LTE RLC layer
  • PDCP NR 2 PDCP layer
  • a split bearer B SP that passes from the core network 20 through the secondary cell group (SCG) and branches from the secondary cell group to the radio base station (eNB 100A) included in the master cell group (MCG) 2 and the like (see FIG. 6 etc.), specifically, Split bearer via SCG is set.
  • the split bearer B SP constitutes the first bearer.
  • Data for core network 20 to UE 200 specifically, downlink user data is transmitted to UE 200 via split bearer B SP .
  • FIG. 3 is a functional block configuration diagram of the eNB 100A and the gNB 100B.
  • the eNB 100A will be described as an example unless otherwise stated.
  • the gNB 100B is different from the eNB 100A in that the gNB 100B corresponds to the NR scheme, and in the present embodiment, the secondary base station is configured.
  • the eNB 100A includes a wireless communication unit 110, a connection control unit 120, a failure notification reception unit 130, a resource control unit 140, and a random access procedure execution unit 150.
  • the eNB 100A provides the function of each layer in the protocol stack illustrated in FIG. 2 by the functional blocks illustrated in FIG. In FIG. 3, only functional blocks related to the present invention are shown.
  • the wireless communication unit 110 executes wireless communication according to the LTE scheme. Specifically, the wireless communication unit 110 transmits and receives a wireless signal according to the LTE scheme with the UE 200. User data or control data is multiplexed to the radio signal.
  • the connection control unit 120 controls the connection between the eNB 100A and the UE 200, and the connection between the eNB 100A and the gNB 100B. Specifically, the connection control unit 120 controls connection in the RRC layer with the UE 200. The connection control unit 120 also controls connection with the gNB 100B via the X interface (Xx / Xn).
  • the connection control unit 120 transmits, to the UE 200, a connection message (RRC message) for setting the split bearer B SP (see FIG. 6, etc.).
  • RRC message a connection message for setting the split bearer B SP
  • the connection control unit 120 can transmit, to the UE 200, RRC Connection Reconfiguration including an information element that allows the secondary cell group (SCG) to be deactivated under a predetermined condition.
  • SCG secondary cell group
  • deactivate is in a state of holding the resource used for setting the split bearer B SP without releasing it, but as the operation of the UE 200, any uplink signal of the cell is It means not transmitting and monitoring the physical downlink control channel (PDCCH).
  • the UE 200 performs downlink quality measurement using downlink synchronization, a reference signal, and the like, but the measurement cycle is a long cycle compared to the RRC Connected state.
  • connection control unit 120 can transmit, to the UE 200, RRC Connection Reconfiguration including an information element that allows deletion of the cell quality measurement identifier in the SCG.
  • RRC Connection Reconfiguration can include an information element that allows deletion of MeasId identifying the quality measurement by UE 200 of Primary SCell (PSCell) and Secondary Cell (SCell) included in SCG.
  • PSCell Primary SCell
  • SCell Secondary Cell
  • MeasId is specified in 3GPP TS 36.331, Chapter 6.3.5, etc., and indicates the configuration of quality measurement of the cell (for example, the relationship between the measurement object (measObject) and the report format (reportConfig)). Identify UE200 stops the quality measurement in SCG, if MeasId in SCG is deleted. That is, UE200 does not perform quality measurement in SCG, if the said MeasId is deleted.
  • connection control unit 120 sends a resource modification request (Secondary Node Modification Request) instructing release of only resources of layers lower than the predetermined layer in the SCG of the split bearer B SP to the gNB 100 B (another wireless base station). Can be sent.
  • a resource modification request Servicedary Node Modification Request
  • the connection control unit 120 may use resources of a layer lower than the RLC layer, that is, RLC NR and MAC NR of the gNB 100 B (note that The Secondary Node Modification Request can be sent to the gNB 100B, which instructs to release the resources of the physical layer (including the physical layer).
  • the connection control unit 120 (this embodiment) is used when the UE 200 reconnects to the same SCG (that is, gNB 100 B) as before releasing the resource. Then, the gNB 100 B can set a split bearer B SP that reuses the released resource.
  • the connection control unit 120 (in the present embodiment, the gNB 100B is applicable) when the UE 200 connects to a different SCG from before releasing the resources. ) Can set up a new split bearer B SP .
  • the failure notification receiving unit 130 receives, from the UE 200, a notification of radio link failure (RLF) in the master cell group (MCG) and the secondary cell group (SCG).
  • RLF radio link failure
  • SCG secondary cell group
  • the failure notification receiving unit 130 receives, from the UE 200, a failure notification (SCG Failure Information) indicating that RLF (referred to as S-RLF) in the SCG has occurred.
  • the resource control unit 140 controls resources in each layer of the protocol stack shown in FIG. Specifically, the resource control unit 140 controls resources required in each layer according to the setting state of the master cell group (MCG) and the secondary cell group (SCG).
  • MCG master cell group
  • SCG secondary cell group
  • the resource control unit 140 (corresponding to the gNB 100B in the present embodiment) does not exceed a predetermined layer in the SCG of the split bearer B SP based on the resource modification request (Secondary Node Modification Request) received from the eNB 100A ( Specifically, the resources of the RLC layer and below are released.
  • the resource control unit 140 releases only the MAC NR and the RLC NR among the MAC NR , the RLC NR , the PDCP NR, and the SDAP NR (see FIG. 2) that constitute the split bearer B SP .
  • the resource control unit 140 releases only resources of layers lower than the predetermined layer in the SCG of the split bearer B SP , and the upper layer resource (PDCP layer of the predetermined layer) Or more) can be held.
  • the resource control unit 140 can reset the split bearer B SP using the upper layer resource held.
  • the random access procedure execution unit 150 executes a random access procedure with the UE 200. Specifically, the random access procedure execution unit 150 executes a random access procedure including reception of Random Access Preamble (Message 1) from the UE 200, transmission of Random Access Response (Message 2) to the UE 200, and the like.
  • Message 1 Random Access Preamble
  • Message 2 Transmission of Random Access Response
  • the random access procedure execution unit 150 executes the random access procedure with the gNB 100 B (another wireless base station) included in the SCG to be reconnected. To the UE 200.
  • the random access procedure execution unit 150 can instruct the execution of the random access procedure with the PSCell included in the SCG via the physical downlink control channel (PDCCH).
  • PSCell included in the SCG via the physical downlink control channel (PDCCH).
  • PDCCH physical downlink control channel
  • the random access procedure execution unit 150 instructs the PSCell to execute the Contention based Random Access procedure using predetermined bits of the PDCCH. Also, the random access procedure execution unit 150 may specify an RA preamble and instruct to execute a Contention free Random Access procedure.
  • the random access procedure execution unit 150 may instruct the execution of the random access procedure with the PSCell via the control element (CE) of the MAC layer (medium access control layer).
  • the random access procedure execution unit 150 can instruct the execution of the Contention based RandomAccess procedure or the Contention free Random Access procedure, as in the case of the PDCCH.
  • random access procedure execution section 150 can prioritize execution of random access procedures with cells belonging to the timing advance group (pTAG) including PSCell. .
  • the random access procedure execution unit 150 instructs the sTAG random access procedure to be executed after the pTAG (TAG cell including PSCell) random access procedure is completed. May be
  • TAG is a group based on uplink (UL) transmission timing from a plurality of UEs, and specifically, propagation delay is almost equal among component carriers (CCs) set in the UEs.
  • CCs component carriers
  • FIG. 4 is a functional block configuration diagram of the UE 200.
  • the UE 200 includes a wireless communication unit 210, a connection control unit 220, a failure notification unit 230, a cell setting unit 240, a quality measurement unit 250, and a random access procedure execution unit 260.
  • UE200 provides the function of each layer in the protocol stack shown in FIG. 2 by the functional block shown in FIG. In FIG. 4, only functional blocks related to the present invention are shown.
  • the wireless communication unit 210 executes wireless communication according to the LTE scheme and the NR scheme. Specifically, the wireless communication unit 210 transmits and receives a radio signal according to the eNB 100A and the LTE method. Also, the wireless communication unit 210 transmits and receives a wireless signal according to the NR scheme with the gNB 100B. User data or control data is multiplexed to the radio signal.
  • the connection control unit 220 controls the connection between the UE 200 and the eNB 100A, and the connection between the UE 200 and the gNB 100B. Specifically, the connection control unit 220 controls the connection in the RRC layer based on the connection message (RRC message) transmitted from the eNB 100A or the gNB 100B.
  • RRC message connection message
  • connection control unit 220 executes connection change processing in the RRC layer based on RRC Connection Reconfiguration received from the eNB 100A (or the gNB 100B).
  • the connection control unit 220 transmits RRC Connection Reconfiguration Complete indicating that the connection change process is completed to the eNB 100A (or the gNB 100B).
  • the connection control unit 220 reconnects the UE 200 to the SCG.
  • S-RLF radio link failure
  • only resources of lower layers than the predetermined layer (RLC layer) in the SCG of the split bearer B SP are released, and the upper layer resources of the predetermined layer are released. (PDCP layer or more) may be held.
  • connection control unit 220 resets the split bearer B SP when the UE 200 reconnects to the same SCG as before releasing the resource.
  • the failure notification unit 230 detects a radio link failure (RLF) in the master cell group (MCG) and the secondary cell group (SCG).
  • RLF radio link failure
  • MCG master cell group
  • SCG secondary cell group
  • the fault notification unit 230 detects the RLF in the SCG based on the detection condition of the RLF (for example, TS 36.300 10.1.6) specified in the 3GPP Technical Standard (TS).
  • TS 3GPP Technical Standard
  • the failure notification unit 230 transmits, to the eNB 100A, a failure notification indicating that a radio link failure (S-RLF) in SCG has occurred.
  • S-RLF radio link failure
  • the failure notification unit 230 can reset the split bearer B SP and can send a return notification indicating that the UE 200 has returned to the SCG to the eNB 100A. Specifically, the failure notification unit 230 transmits SCG recovery Information indicating that the UE 200 has recovered to the SCG to the eNB 100A.
  • the cell setting unit 240 performs setting on a cell of a master cell group (MCG) or a secondary cell group (SCG) to which the UE 200 can connect. Specifically, the cell setting unit 240 deactivates the SCG in a predetermined case.
  • MCG master cell group
  • SCG secondary cell group
  • the cell setting unit 240 includes an information element that permits deactivation (deactivation), and the radio in the SCG
  • deactivation a link failure
  • RLF link failure
  • the cell configuration unit 240 includes the information element in the received RRC Connection Reconfiguration even when the UE 200 is not permitted to autonomously deactivate the configuration of the cell included in the SCG. If the RLF in the SCG is detected, the setting of the cells included in the SCG is inactivated.
  • the cell setting unit 240 includes an information element that allows deletion of the cell quality measurement identifier in the SCG, and the radio link in the SCG
  • a failure (RLF) is detected, the quality measurement of the cell (in the present embodiment, the cell C2) included in the SCG is stopped.
  • the quality measurement unit 250 measures the cell reception quality in the master cell group (MCG) and the secondary cell group (SCG). Specifically, the quality measurement unit 250 measures the reception quality (cell reception quality) of the cells included in the MCG and SCG.
  • the quality measurement unit 250 measures reference signal received power (RSRP) and reference signal received quality (RSRQ) in each cell, and transmits a measurement report (measurement report) when a predetermined condition (entering condition) is satisfied. .
  • RSRP reference signal received power
  • RSSQ reference signal received quality
  • the quality measurement unit 250 after a part of resources (below the RLC layer) of the split bearer B SP in the gNB 100 B (NR SgNB) is released, the quality measurement unit 250 has a longer cycle than before releasing the resources. The reception quality in SCG can be measured.
  • the random access procedure execution unit 260 executes a random access procedure with the eNB 100A or the gNB 100B.
  • the random access procedure execution unit 260 executes the random access procedure with the gNB 100 B (another wireless base station) included in the reconnected SCG. .
  • random access procedure execution unit 260 when there are a plurality of timing advance groups (TAGs) in SCG, random access procedure execution unit 260, as in random access procedure execution unit 150 (see FIG. 3), includes a timing advance group (pTAG) including PSCell. It is possible to execute a random access procedure with the cell to which it belongs.
  • TAGs timing advance groups
  • PSCell timing advance group
  • Radio Communication System 10 Next, the operation of the radio communication system 10 will be described. Specifically, operations related to configuration and release of a split bearer via SCG by eNB 100 A (LTE MeNB), gNB 100 B (NR SgNB), and UE 200 will be described.
  • eNB 100 A LTE MeNB
  • gNB 100 B NR SgNB
  • UE 200 UE 200
  • FIG. 5 shows a split bearer control sequence (Operation Example 1) including radio link failure (S-RLF) in the secondary cell group.
  • S-RLF radio link failure
  • FIG. 7 shows a configuration example of a split bearer B SP (Split bearer via SCG) .
  • split bearer B SP Thin line
  • split bearer via SCG branches from PDCP NR of gNB 100 B toward eNB 100 A.
  • a thin line indicates a path of a configurable bearer (not limited to a split bearer) (see 3GPP TR 38. 804).
  • the split bearer B SP branched toward the eNB 100A provides a logical communication path to the UE 200 via the RLC LTE and the MAC LTE of the eNB 100A. Also, the split bearer B SP provides a logical communication path to the UE 200 via the RLC NR and MAC NR of the gNB 100B.
  • an SCG split bearer as shown in FIG. 7 is set.
  • the eNB 100A transmits, to the UE 200, RRC Connection Reconfiguration which requests configuration of a split bearer B SP (SCG split bearer) (S10).
  • SCG split bearer SCG split bearer
  • the split bearer B SP is referred to as “split bearer via SCG” as described above, but in the drawing, it is appropriately described as “SCG split bearer” for convenience.
  • the UE 200 configures a split bearer B SP based on the received RRC Connection Reconfiguration, and transmits an RRC Connection Reconfiguration Complete to the eNB 100A (S20, S30).
  • the UE 200 detects RLF (S-RLF) in SCG, and transmits a failure notification (SCG Failure Information) indicating that S-RLF has occurred to the eNB 100A (S40, S50).
  • S-RLF RLF
  • SCG Failure Information failure notification
  • FIG. 8 shows an example of configuration of split bearer B SP (Split bearer via SCG) (after releasing some resources). As shown in FIG. 8, since resources of lower layers than the RLC NR layer of gNB 100 B are released, split bearer B SP (resources constituting the segment) in the section (dotted line section in the figure) directed from gNB 100 B directly to UE 200 Is released.
  • the UE 200 After that, the UE 200 returns to the PSCell of the SCG that was connected before the S-RLF detection (S40) (S60).
  • the reason why the UE 200 returns to the PSCell before S-RLF detection includes the case where the cell reception quality of the PSCell improves, or the failure recovery of the PSCell (gNB 100B).
  • the UE 200 transmits, to the eNB 100A, a Measurement Report regarding cells included in SCG, specifically, PSCell and SCell (S70).
  • the eNB 100 A re-connects the UE 200 with the PSCell based on the received Measurement Report (eg, Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference plus Noise power Ratio (SINR), etc.). If it is determined that it is possible, the UE 200 is instructed to execute a random access procedure in PSCell (S80).
  • Measurement Report eg, Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference plus Noise power Ratio (SINR), etc.
  • the UE 200 executes the random access procedure with the gNB 100B forming the PSCell based on the random access procedure execution instruction (S90). Specifically, the UE 200 transmits Random Access Preamble (Message 1) to the gNB 100B. In addition, the gNB 100B returns Random Access Response (Message 2).
  • the UE200 will transmit SCG recovery Information to eNB100A, if a random access procedure is completed (S100).
  • SCG recovery Information indicates that the UE 200 has returned to the SCG and resumed UL transmission.
  • the SCG recovery Information can be defined, for example, as a message of the RRC layer.
  • FIG. 6 shows a split bearer control sequence (Operation Example 2) including radio link failure (S-RLF) in the secondary cell group.
  • S-RLF radio link failure
  • the UE 200 executes the random access procedure based on the execution instruction of the random access procedure from the eNB 100A, but in this operation example, after the UE 200 returns to PSCell, the UE 200 performs the random access procedure Be done.
  • the operation example 1 portions different from the operation example 1 will be mainly described, and the description of the same portions will be appropriately omitted.
  • the UE 200 determines that the PSCell quality, specifically, the cell reception quality satisfies the predetermined value (S65).
  • the UE 200 measures the cell reception quality (RSRP, RSRQ, SINR, etc.) in the PSCell, as in the measurement report shown in the operation example 1, and determines whether the cell reception quality exceeds a predetermined value.
  • RSRP cell reception quality
  • RSRQ cell reception quality
  • SINR SINR
  • the predetermined value may be notified from the eNB 100A to the UE 200.
  • the predetermined value may be notified using RRC Connection Reconfiguration for setting the SCG split bearer.
  • UE200 performs a random access procedure with PSCell (gNB100B), when the cell reception quality in PSCell satisfy
  • the following operation and effect can be obtained. Specifically, when the eNB 100A reconnects the UE 200 to the same SCG as before the resource release of the layer lower than the predetermined layer (RLC layer) of the split bearer B SP , the upper layer resource held (PDCP layer or higher) Reconfigure the split bearer B SP using. Also, when the split bearer B SP is reconfigured, the eNB 100A instructs the UE 200 to perform a random access procedure with the gNB 100B included in the reconnected SCG.
  • the eNB 100A reconnects the UE 200 to the same SCG as before the resource release of the layer lower than the predetermined layer (RLC layer) of the split bearer B SP , the upper layer resource held (PDCP layer or higher) Reconfigure the split bearer B SP using. Also, when the split bearer B SP is reconfigured, the eNB 100A instructs the UE 200 to perform a random access procedure with the gNB 100B included in the reconnected SCG.
  • RLC layer predetermined
  • the processing delay can be significantly reduced by the RRC layer message as compared with the case of reconfiguring the split bearer B SP using the held upper layer resource. That is, since the upper layer resource split bearer B SP is held, rather than re-setting in the RRC layer, by executing only the random access procedure may reconfigure the split bearer B SP quickly.
  • the split bearer B SP via the SCG when the split bearer B SP via the SCG is configured, a part of resources are held, and therefore, an increase in the amount of signaling due to the release and configuration of the split bearer B SP is repeated. It is possible to further reduce the delay associated with the split bearer B SP reconfiguration.
  • the split bearer B SP can be similarly reconfigured by the initiative of the UE 200 instead of the instruction from the eNB 100A. According to such reconfiguration of the split bearer B SP led by the UE 200, it is possible to reduce the delay associated with the reconfiguration of the split bearer B SP while reducing the processing load on the network side (eNB 100A).
  • PDCCH or MAC CE can be used for the execution instruction of the random access procedure by the eNB 100A. Therefore, execution of the random access procedure can be instructed to the UE 200 by an implementation of the UE 200 and the eNB 100A, or an appropriate method according to the requirement.
  • priority can be given to execution of a random access procedure with a cell belonging to a TAG including PSCell. For this reason, UL transmission via the cell (SCell) belonging to TAG including PSCell can also be resumed promptly.
  • the UE 200 can transmit SCG recovery Information indicating that the UE 200 has recovered to the SCG to the eNB 100A. Therefore, the eNB 100A can quickly and reliably recognize that the UE 200 can return to the SCG (PSCell) before S-RLF and can resume UL transmission.
  • SCG SCG
  • the eNB 100A is a radio base station (eNB) of the LTE system, configures a master base station
  • the gNB 100B is a radio base station (gNB) of an NR scheme, and configures a secondary base station.
  • the radio base station (gNB) of the NR scheme may constitute a master base station
  • the radio base station (eNB) of the LTE scheme may constitute a secondary base station.
  • each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly two or more physically and / or logically separated devices. It connects (for example, wired and / or wirelessly), and may be realized by a plurality of these devices.
  • FIG. 9 is a diagram showing an example of the hardware configuration of the device.
  • the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007 and the like.
  • Each functional block (see FIGS. 3 and 4) of the device is realized by any hardware element of the computer device or a combination of the hardware elements.
  • the processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
  • CPU central processing unit
  • the memory 1002 is a computer readable recording medium, and may be, for example, a ROM (Read).
  • the memory may be configured of at least one of an Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory).
  • the memory 1002 may be called a register, a cache, a main memory (main storage device) or the like.
  • the memory 1002 can store a program (program code) capable of executing the method according to the above-described embodiment, a software module, and the like.
  • the storage 1003 is a computer readable recording medium, and for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray A (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like may be used.
  • the storage 1003 may be called an auxiliary storage device.
  • the above-mentioned recording medium may be, for example, a database including the memory 1002 and / or the storage 1003, a server or other appropriate medium.
  • the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like.
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
  • the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
  • each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured by a single bus or may be configured by different buses among the devices.
  • notification of information is not limited to the above-described embodiment, and may be performed by another method.
  • notification of information may be physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (for example, RRC signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (for example)). Master Information Block), SIB (System Information Block), other signals, or a combination of these, or RRC signaling may be referred to as an RRC message, eg, RRC Connection Setup message, RRC It may be a Connection Reconfiguration message or the like.
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • RRC signaling for example, RRC signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (for example)
  • MIB for example
  • Master Information Block Master Information Block
  • SIB System Information Block
  • RRC signaling may be referred to as an RRC message, eg, RRC Connection Setup message, RRC It
  • the input / output information may be stored in a specific place (for example, a memory) or may be managed by a management table. Information to be input or output may be overwritten, updated or added. The output information may be deleted. The input information may be transmitted to another device.
  • the specific operation performed by the eNB 100A may be performed by another network node (device).
  • the function of the eNB 100A may be provided by a combination of a plurality of other network nodes.
  • the channels and / or symbols may be signals, where relevant.
  • the signal may be a message.
  • the terms “system” and “network” may be used interchangeably.
  • the parameter or the like may be represented by an absolute value, may be represented by a relative value from a predetermined value, or may be represented by another corresponding information.
  • radio resources may be indexed.
  • the eNB 100A can accommodate one or more (eg, three) cells (also referred to as sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small base station RRH for indoor use: Remote Communication service can also be provided by Radio Head.
  • a base station subsystem eg, a small base station RRH for indoor use: Remote Communication service can also be provided by Radio Head.
  • cell refers to a portion or all of the coverage area of a base station and / or a base station subsystem serving communication services in this coverage.
  • base station eNodeB
  • gNB gNodeB
  • access point access point
  • femtocell small cell, and so on.
  • the UE 200 may be a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal by a person skilled in the art , Remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • any reference to an element using the designation "first,” “second,” etc. as used herein does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way of distinguishing between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be taken there, or that in any way the first element must precede the second element.
  • wireless communication system 20 core network 100A eNB 100B gNB 110 wireless communication unit 120 connection control unit 130 fault notification reception unit 140 resource control unit 150 random access procedure execution unit 200 UE 210 wireless communication unit 220 connection control unit 230 fault notification unit 240 cell setting unit 250 quality measurement unit 260 random access procedure execution unit 1001 processor 1002 memory 1003 storage 1004 communication device 1005 input device 1006 output device 1007 bus

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Dans la présente invention, un eNB (100A) paramètre une porteuse divisée qui passe par un SCG à partir d'un réseau central et se divise à partir du SCG en l'eNB (100A) qui est inclus dans un MCG. Si un UE (200) se reconnecte au même SCG que celui avant la libération d'une partie des ressources de la porteuse divisée, l'eNB (100A) paramètre à nouveau la porteuse divisée qui utilise une ressource de couche supérieure conservée. L'UE (200) exécute une procédure d'accès aléatoire à l'aide d'un gNB (100B) inclus dans le SCG reconnecté.
PCT/JP2018/029615 2017-08-10 2018-08-07 Station de base sans fil et dispositif utilisateur WO2019031505A1 (fr)

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JP2019535675A JPWO2019031505A1 (ja) 2017-08-10 2018-08-07 無線基地局及びユーザ装置
JP2022119865A JP2022141934A (ja) 2017-08-10 2022-07-27 無線基地局及びユーザ装置

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